Unfortunately, there's no way we can help you without getting that kind of access. That being said, we really expect people to do their due diligence when giving security apps permission to act on their behalf. We'd love to hear if you can think of a better way for us to do it.
Don't get me wrong, I find your site useful, and must I add, well designed. Maybe you could ask the user if he wishes to revoke the authorizations for your own app after scanning.
All you need to do to get that done is disable the extension. Once that's done, there is no access.